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True [87]
3 years ago
7

How many moles are there in 25 g of water?

Chemistry
2 answers:
nordsb [41]3 years ago
8 0
1.39 moles in 25 grams of water
Misha Larkins [42]3 years ago
3 0
1 mole<span> H2O = 18.0 g H2O.</span>
<span>25 g H2O </span>1 mol<span> H2O.</span>
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λmax for the π → π* transition in ethylene is 170 nm. Is the HOMO-LUMO energy difference in ethylene greater than or less than t
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the HOMO-LUMO energy difference in ethylene is greater than that of cis,trans−1,3−cyclooctadiene

Explanation:

The λmax is the wavelength of maximum absorption. We could use it to calculate the HOMO-LUMO energy difference as follows:

For ethylene

E= hc/λ= 6.63×10^-34×3×10^8/170×10^-9= 1.17×10^-18J

For cis,trans−1,3−cyclooctadiene

E= hc/λ=6.63×10^-34×3×10^8/230×10^-9=8.6×10^-19J

Therefore, the HOMO-LUMO energy difference in ethylene is greater than that of cis,trans−1,3−cyclooctadiene

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